In 70 years, Portland Cement-Factory dug for chalk and chalk sludge and this is the reason for the 10-20 m. tall cliffs. Today, the chalk pit is a nature area with interesting plants and animals.
What is characteristic for this chalk pit is the 600 m. long and 9 m. deep lake with greenish-blue water. It is the lights reflection in the alkaline- and calcium holding water that is the reason for the colour.
On the cliffs heart grass grows here and there and parsnips grows where the earth contains lime.
Grey-throat grebes and a single Bud Swan couple, which are very territory demanding, lives in the area.
During winter time, the lake is a lay-by for many birds and about 100 water-bats goes into winter hibernation in a closed mine tunnel.
If you are into fishing, it is possible to catch perch or roach in the chalk pit
Be aware that swimming here is dissuaded!